|Table of Contents|

Evolution Law of Fissures of Red Clay Slope Under Wet-dry Cycles(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年05期
Page:
52-61
Research Field:
Publishing date:

Info

Title:
Evolution Law of Fissures of Red Clay Slope Under Wet-dry Cycles
Author(s):
CHEN Kai-sheng
(College of Civil Engineering, Guizhou University, Guiyang 550025, Guizhou, China)
Keywords:
red clay;  model test;  wet-dry cycle;  fissure;  image processing
PACS:
TU446
DOI:
-
Abstract:
In order to study the evolution law of fissures of red clay slope under wetting and drying cycles, the indoor slope model was used to simulate the sunshine-rainfall dry-wet cycle, and the grating images were binarized by image processing technology. The quantitative indexes such as the fissure rate, the number of fissures, the total length of fissures and the number of soil blocks were extracted. The relationship between the evolution of fracture indexes and the number of cycles was analyzed under the rainfall evaporation cycle. The results show that the main cause of red clay cracking is the difference of matric suction between upper and lower parts of soil caused by water content gradient, resulting in uneven soil shrinkage, and the spatial distribution of soil swelling and shrinkage. Permeability and dehumidification rate are the key factors to determine the water content gradient. The width, depth and fracture rate of the fissure increase firstly and then tend to be stable with the increase of the number of cycles. The total number of fissures, the number of soil blocks and the total length of the fissure reach the maximum after the first dry-wet cycle, and decrease to varying degrees after the second cycle, and then the total number of fissures tends to be stable, whereas the total length of the fissure and the number of blocks still increase slightly in the later cycle.

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Last Update: 2019-09-29